There is a bug, quite serious, which occurs when uninstalling a module (any module). The error is:
[quote:2eh38jrg]Type: E_USER_ERROR (256)
Message: mysqlt error: [1451: Cannot delete or update a parent row: a foreign key constraint fails ..[/quote:2eh38jrg].
Please do not uninstall any modules until your installation is upgraded to version 1.6.3 which includes a patch that fixes this problem.